Deep focusing on the role of microstructures in shape memory properties of polymer composites: A critical review

Synthesis and Properties of a New Chitosan‐Based Shape Memory Polymer and its Composites

“…Thus, there is a relation between shape recovery and the weight fraction of the soft segments. And also, at the Tg there will be a strong interaction between the hard and soft segments [37] …”

“…And also, at the Tg there will be a strong interaction between the hard and soft segments. [37] Furthermore, there is an interfacial interaction between the polymer chains and the particles (HAp and turmeric) which involves a new elastic contribution that allows the mobility of the molecular chains that endure stretching that facilitates the shape recovery behavior above Tg. [38] In the present SMP system, along with chemical crosslinks or physical entanglement, a network structure is also formed with the fillers serving as the net points through strong covalent bonds in the composites and mechanical interlocking between the fillers and the polymer matrix.…”

Elucidating the Role of Interfacial Hydrogen Bonds on Glass Transition Temperature Change in a Poly(Vinyl Alcohol)/SiO2 Polymer‐Nanocomposite by Noncovalent Interaction Characterization and Atomistic Molecular Dynamics Simulations

“…[ 10 ] Consistent with our MD simulations, such physical interaction imposes restrictions on the segmental mobility of the polymer chain, resulting in an increased T g . [ 30 ] PVA/SiNP‐1.0 exhibits T g at 90 °C, which is lower than PVA/SiNP‐0.8. The lowering of T g at comparatively higher loading than the optimum 0.8 wt% SiNP could be a result of the agglomeration of SiNP leading to a reduction in its physical interaction with PVA.…”

“…SiNP reaches maximum interaction with PVA polymer chains in the matrix only when the optimum wt% of its loading is achieved. [ 30 ] When SiNP is added below the optimal loading wt%, there are insufficient OH groups from the SiO 2 surface to form non‐covalent interactions with the PVA polymer chain. Therefore, SiNP loading that is higher or lower than the optimal amount can increase the segmental mobility of PVA polymer chain and lead to lower T g .…”

Smart polymer nanocomposites: A review

“…In general, thermoset SMPs can store more energy and endure more cycles (shapechanging) than thermoplastic ones due to the crosslinked bonds. Nonetheless, thermoplastic SMP can be manufactured by a facile processing method [52]. Figure 2 shows general shape memory behavior of thermally triggered SMP [53].…”